According to Al Jazeera, two Pakistani security sources indicated that negotiations between the United States and Iran are highly likely to take place before Friday. The sources stated that their assessment is based on the following factors: Two US heavy transport aircraft (C-17 Globemaster III) have landed at Nur Khan Air Base in Rawalpindi. The base is located near Pakistan's capital, Islamabad. Furthermore, roads from the airport to the Red Zone in Islamabad have been temporarily closed, indicating heightened security measures. Finally, the sources mentioned that the Serena Hotel and the Marriott Hotel in Islamabad are clearing out guests and are not accepting new reservations until Friday. The Serena Hotel was the venue for the first round of US-Iran talks on April 11. (Jin10)